<template>

    <el-container class="home-container">
        <!-- 头部区域 -->
        <el-header> 
            <div>
                <img src="../assets/heima.png" alt="">
                <span>后台管理系统</span>
            </div>
            
            <el-button type="info" @click="logout" >退出</el-button>
        </el-header>
        
        <!-- 页面主体区域 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse ? '60px' : '200px'">
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <el-menu
                background-color="#333744"
                text-color="#fff"
                active-text-color="#409EFF"
                unique-opened
                :collapse="isCollapse"
                :collapse-transition="false"
                router
                >
                <!-- 一级菜单 -->
                <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id" >
                    <!-- 一级菜单模板区域 -->
                    <template slot="title">
                        <!-- 图标 -->
                        <i :class="iconsObj[item.id]"></i>
                        <!-- 文本标题 -->
                        <span>{{item.authName}}</span>
                    </template>
                    <!-- 二级菜单 -->

                    <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id"
                     @click="saveNavState('/'+subItem.path)" >
                         <template slot="title">
                        <!-- 图标 -->
                        <i class="el-icon-menu"></i>
                        <!-- 文本标题 -->
                        <span>{{subItem.authName}}</span>
                    </template>
                    </el-menu-item>
                </el-submenu>
              
                </el-menu>

            </el-aside>
            <!-- 右侧内容主体 -->
            <el-main>
                <!-- 路由占位符 -->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>


    
</template>

<script> 
export default {

    data(){
        return {
            menulist:[],
            iconsObj:{
                '125':'iconfont icon-user',
                '103':'iconfont icon-tijikongjian',
                '101':'iconfont icon-shangpin',
                '102':'iconfont icon-danju',
                '145':'iconfont icon-baobiao'
            },
            // 折叠
            isCollapse:false,
            // 被激活的链接地址
            activePath:''
        }
    },

    // created函数中调用ajax获取页面初始化所需的数据。
    created(){
        this.getmenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },

    methods:{
        logout(){
            window.sessionStorage.clear() // 账号退出功能，销毁token\
            this.$router.push('./login')
        },
        // 获取所有菜单
        async getmenuList(){
            const { data : res} = await this.$http.get('menus')
            // 后台验证错误
            console.log(res);
            if(res.meta.status !== 200 ) return this.$message.error(res.meta.msg)
            // 拿到菜单数据
            this.menulist = res.data
            // console.log(this.menulist);
        },
        // 点击按钮切换菜单的折叠 展开
        toggleCollapse(){
            this.isCollapse = !this.isCollapse
        } ,
        // 保存链接激活状态
        saveNavState(activePath){
            window.sessionStorage.setItem('activePath',activePath)
            this.activePath = activePath
        }
    }
}
</script>

<style lang='less' scoped> 
    .home-container {
        height: 100%;
    }
    .el-header {
        background-color: #373D41;
        display: flex;
        justify-content: space-between; // 左右对齐
        padding-left: 0;
        align-items: center;
        color: #fff;
        font-size: 20px;
        > div {
            display: flex;
            align-items: center;
            span {
                margin-left: 15px ;
            }
        }
    }
    .el-aside {
        background-color: #333744;
        .el-menu {
              border-right: none 

        }
    }
    .el-main {
        background-color: #eaedf1;
    }
    
    .iconfont {
         margin-right: 10px;
    }
    .toggle-button {
        background-color: #4A5064;
        font-size: 10px;
        line-height: 24px;
        color: #fff;
        text-align: center;
        letter-spacing: 0.2em;
        cursor: pointer;
    }
</style>